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Mkey [24]
2 years ago
11

PLEASE HELPP i know the answer is 12 but how?

Mathematics
1 answer:
zheka24 [161]2 years ago
4 0
A^2+b^2=c^2

a^2+9^2=15^2

a^2+81=225
-81 -81

a^2= 144 (square root both sides)
a=12
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